iio: mlx90614: Add MLX90615 support
Add support for MLX90615 Infra Red Thermometer, which seems to be the predecesor of MLX90614 . There are significant differences in the register layout compared to MLX90614, but the functionality of the device is virtually identical. The following differences have been identified: - RAM/EEPROM/SLEEP access opcodes are different - RAM/EEPROM registers are at different offsets - EEPROM emissivity and configuration registers are at different offsets - EEPROM configuration register bits are shuffled around - EEPROM emissivity settings are 14 bit on MLX90615 , 16 bit on MLX90614 - MLX90615 can only ever support one sensor, MLX90614 could support two - FIR filter is set to fixed settings on MLX90615 - IIR filter coefficients are different This patch fills in the MLX90615 specific description and quirk handling. The IIR filter coefficients were provided by Melexis as follows: 0b0000 - Forbidden value 0b0001 - 100% - settling time = refresh rate = 205ms (around 5Hz) 0b0010 - 50% - settling time = 2050ms (around 0.5Hz) 0b0011 - 33% - settling time = 36900ms (around 0.3Hz) 0b0100 - 25% - settling time = 5125ms (around 0.2Hz) 0b0101 - 20% - settling time = 6355ms (around 0.15Hz) 0b0110 - 17% - settling time = 7790ms (around 0.13Hz) 0b0111 - 14% - settling time = 9225ms (around 0.1Hz) Signed-off-by: Marek Vasut <marex@denx.de> Acked-by: Crt Mori <cmo@melexis.com> Link: https://lore.kernel.org/r/20230510102251.10118-6-marex@denx.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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@ -1,12 +1,15 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
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* mlx90614.c - Support for Melexis MLX90614/MLX90615 contactless IR temperature sensor
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*
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* Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
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* Copyright (c) 2015 Essensium NV
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* Copyright (c) 2015 Melexis
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*
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* Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor
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* Driver for the Melexis MLX90614/MLX90615 I2C 16-bit IR thermopile sensor
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*
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* MLX90614 - 17-bit ADC + MLX90302 DSP
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* MLX90615 - 16-bit ADC + MLX90325 DSP
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*
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* (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
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*
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@ -35,6 +38,10 @@
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#define MLX90614_OP_EEPROM 0x20
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#define MLX90614_OP_SLEEP 0xff
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#define MLX90615_OP_EEPROM 0x10
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#define MLX90615_OP_RAM 0x20
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#define MLX90615_OP_SLEEP 0xc6
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/* Control bits in configuration register */
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#define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
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#define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
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@ -43,11 +50,16 @@
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#define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
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#define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
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#define MLX90615_CONFIG_IIR_SHIFT 12 /* IIR coefficient */
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#define MLX90615_CONFIG_IIR_MASK (0x7 << MLX90615_CONFIG_IIR_SHIFT)
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/* Timings (in ms) */
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#define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
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#define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
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#define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
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#define MLX90615_TIMING_WAKEUP 22 /* time to hold SCL low for wake-up */
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#define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */
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/* Magic constants */
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@ -305,8 +317,8 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev,
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*val2 = ret * NSEC_PER_SEC / chip_info->emissivity_max;
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}
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return IIO_VAL_INT_PLUS_NANO;
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case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with
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FIR = 1024 */
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/* IIR setting with FIR=1024 (MLX90614) or FIR=65536 (MLX90615) */
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case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
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ret = mlx90614_power_get(data, false);
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if (ret < 0)
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return ret;
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@ -664,14 +676,42 @@ static const struct mlx_chip_info mlx90614_chip_info = {
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},
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};
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static const struct mlx_chip_info mlx90615_chip_info = {
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.op_eeprom_emissivity = MLX90615_OP_EEPROM | 0x03,
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.op_eeprom_config1 = MLX90615_OP_EEPROM | 0x02,
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.op_ram_ta = MLX90615_OP_RAM | 0x06,
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.op_ram_tobj1 = MLX90615_OP_RAM | 0x07,
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.op_ram_tobj2 = MLX90615_OP_RAM | 0x08,
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.op_sleep = MLX90615_OP_SLEEP,
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.dual_channel = false,
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.wakeup_delay_ms = MLX90615_TIMING_WAKEUP,
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.emissivity_max = 16383,
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.fir_config_mask = 0, /* MLX90615 FIR is fixed */
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.iir_config_mask = MLX90615_CONFIG_IIR_MASK,
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/* IIR value 0 is FORBIDDEN COMBINATION on MLX90615 */
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.iir_valid_offset = 1,
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.iir_values = { 500, 50, 30, 20, 15, 13, 10 },
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.iir_freqs = {
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{ 0, 100000 }, /* 14% ~= 0.10 Hz */
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{ 0, 130000 }, /* 17% ~= 0.13 Hz */
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{ 0, 150000 }, /* 20% ~= 0.15 Hz */
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{ 0, 200000 }, /* 25% ~= 0.20 Hz */
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{ 0, 300000 }, /* 33% ~= 0.30 Hz */
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{ 0, 500000 }, /* 50% ~= 0.50 Hz */
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{ 5, 000000 }, /* 100% ~= 5.00 Hz */
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},
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};
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static const struct i2c_device_id mlx90614_id[] = {
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{ "mlx90614", .driver_data = (kernel_ulong_t)&mlx90614_chip_info },
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{ "mlx90615", .driver_data = (kernel_ulong_t)&mlx90615_chip_info },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, mlx90614_id);
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static const struct of_device_id mlx90614_of_match[] = {
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{ .compatible = "melexis,mlx90614", .data = &mlx90614_chip_info },
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{ .compatible = "melexis,mlx90615", .data = &mlx90615_chip_info },
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{ }
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};
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MODULE_DEVICE_TABLE(of, mlx90614_of_match);
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